I made peanut brittle for the holidays last week and sampled my fair share. That night, I had a bad reaction to it (sour stomach, diarrhea and intestinal gas).
I cleared the peanut brittle in the morning. That night I had another sampling and had no adverse reaction. The next night, I had my fair share of caramel popcorn and got sick in the same way again. The next day, I cleared the caramel popcorn and the next night ate more. Again, I had no bad reaction.